Any Daemon of Khorne whose unit is within 6" of a Bloodmaster on a Blood Throne benefits from the Bloodmaster's Locus, exactly as if it were in the same unit.
Source: Warhammer Armies Project: Unofficial 9th Edition
Any Daemon of Khorne whose unit is within 6" of a Bloodmaster on a Blood Throne benefits from the Bloodmaster's Locus, exactly as if it were in the same unit.